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【Aquarium Air Stone 4 Pack】Includes 4 blue air stone balls, ideal as high-performance aquarium air stone for home fish tanks and aquatic setups. 【Efficient Oxygenation with Medium Bubbles】This aquarium air stone produces dense, steady bubbles to boost oxygen levels, perfect for healthy fish and plants. 【Stable & Weighted Design】Heavy-duty airstones for aquariums that sink and stay firmly in place, ensuring consistent aeration for all tank sizes. 【Durable Safe Mineral Material】High-temperature sintered construction makes these air stones for fish tanks long-lasting and safe for freshwater & saltwater use. 【Wide Compatibility】Fits standard airline tubing, these versatile airstones for aquariums work for tanks, ponds, DWC systems and hydroponics.